loop0: detected capacity change from 0 to 32768
BUG at fs/jfs/jfs_dmap.c:3089 assert(nb <= DBWORD)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:3089!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4963 Comm: syz.0.16 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : dbFindBits+0x184/0x1b0 fs/jfs/jfs_dmap.c:3089
lr : dbFindBits+0x184/0x1b0 fs/jfs/jfs_dmap.c:3089
sp : ffff80001f487890
x29: ffff80001f487890 x28: 00000000ffffffff x27: dfff800000000000
x26: ffff0000d886f800 x25: ffff0000d886f021 x24: 000000000000000a
x23: 0000000000000000 x22: ffff0000c0d92000 x21: 0000000000000400
x20: 00000000ffffffff x19: 000000000000000a x18: 0000000000000001
x17: 0000000000000000 x16: ffff8000112695d4 x15: 00000000ffffffff
x14: 0000000000000001 x13: 1fffe000341ef8d7 x12: 0000000000ff0100
x11: 0000000000000000 x10: 0000000000000000 x9 : 1ca17153dfee4100
x8 : 1ca17153dfee4100 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff80001f487198 x4 : ffff80001438f560 x3 : ffff80000a7606cc
x2 : ffff0001a0f70d50 x1 : 0000000100000000 x0 : 0000000000000032
Call trace:
 dbFindBits+0x184/0x1b0 fs/jfs/jfs_dmap.c:3089
 dbAllocDmapLev+0x13c/0x36c fs/jfs/jfs_dmap.c:2053
 dbAllocCtl+0x130/0x900 fs/jfs/jfs_dmap.c:1893
 dbAllocAG+0x1c0/0xdc0 fs/jfs/jfs_dmap.c:1421
 dbDiscardAG+0x1e0/0x66c fs/jfs/jfs_dmap.c:1676
 jfs_ioc_trim+0x3e8/0x5e0 fs/jfs/jfs_discard.c:106
 jfs_ioctl+0x364/0x53c fs/jfs/ioctl.c:132
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl fs/ioctl.c:860 [inline]
 __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:860
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1d0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Code: 9003fae3 91340063 52818222 95e78b43 (d4210000) 
---[ end trace 456407dec8822e78 ]---